Dynamics of Disk Galaxies and Their Satellites

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We address the heating and survival of galaxy disks by infalling satellites using self-consistent N-body simulations. We consider satellites with a variety of internal structures as well several orbits with different eccentricities and orientations. Also, the role of the central region of the galaxy (through a bulge) is studied. We found that the analytical results of Toth & Ostriker (1992) overestimate the heating and thickening of the disk by a factor of 2-3. In particular, we found disks are more robust to the accretion of massive satellites (MS ~ 0.2 MD) that follow retrograte orbits. Finally, the importance of the responsiveness of the halo is analized.

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